Name:
Per.:
Date:
VOLCANOES: Ch. 22.6 Worksheet
1. What is the difference between magma and lava?
2. Why does magma rise to Earth’s surface?
3. What is the name of the volcanic structure where magma collects before an
eruption?
4. What are the characteristics of the magma associated with a quiet eruption?
(Discuss silica, water content, temperature and viscosity)
5. What are the characteristics of the magma associated with an explosive eruption?
(Discuss silica, water content, temperature and viscosity)
6. Would a pyroclastic eruption be quiet or explosive?
Shield
Volcano Types: Matching
Composite
Cinder cone
7._____________________
Steep sided, tall and often snow-caped
8._____________________
Large and broad, gently sloping, NOT steep sided
9._____________________
Simple, small, and steep sided
10.____________________
Has quiet eruptions of liquidy lava
11.____________________
Has eruptions of cinders, ash, and lava
12.____________________
Has explosive and dangerous eruptions of gas, ash, and
super-heated rock fragments.
13.____________________
The Hawaiian volcanoes
14.____________________
Mt. St. Helens in Washington state or Mt. Pinatubo in
the Phillipines
15.____________________
Volcanoes in California.
16. True or False: Most of the world’s volcanoes occur along plate boundaries.
17. A region of active magma under the crust that feeds volcanoes is known as a/an:
__________________________
18. The subduction zone along the edge of the Pacific ocean plate, where many
volcanoes are found is known as the ___________________ _______ _______________.
19.
Identify the volcano based on its picture.
A. _______________________
B. _______________________
C. _______________________
20. The Hawaiian volcanoes formed over a _____________________________
a. sea floor spreading zone
b. rift zone
c. hot spot
d. subduction
21. The reason why the Hawaiian islands are a chain of islands is because …
a. The ocean floor moves over a hot spot
b. The hot spot keeps moving
22. Based on the picture, which is the OLDEST Hawaiian island?
23. Mt. Uzen is a volcano in Japan. Japan is located on a plate boundary, where the
pacific ocean plate meets the continental Eurasion plate. How might Mt. Uzen have
formed?
a. It formed by subduction.
b. It formed by sea floor spreading
c. It formed over a hot spot.
d. It formed at a rift zone.
24. The volcanoes in Iceland sit on top of the Mid-ocean ridge. These volcanoes formed
by:
a. Rifting
b. Sea floor spreading
c. hot spot
d. subduction
25. The volcanoes in Africa form on a plate boundary where two land plates pull apart
from one another. These volcanoes form by …
a. Rifting
b. Sea floor spreading
c. hot spot
d. subduction
26. An underwater volcano is called a: ________________________.
Matching: Volcanic features that are not VOLCANOES.
Sill
Volcanic Dike
Batholith
Lava Plateau
27.
________________
An enormous collection of magma that cools under the surface
and pushes up the rock on top of it to make mountains.
28.
________________
When lava comes out of fissures/cracks in the ground and runs all
over the surface before hardening. This lava builds layer upon
layer over time.
29.
________________
When magma squeezes between rock layers and hardens. The
magma hardens parallel to the existing rock layers.
30.
________________
When magma squeezes through rock layers and hardens. The
magma cuts across rock layers.